Malicious PDF — malware analysis report

Static analysis result for SHA-256 46661a268fa28095…

MALICIOUS

PDF

75.4 KB Created: 2020-12-26 05:36:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29230339cfa6c7c5e437770681ba18eb SHA-1: 1b8fdc584ff543526a1f73287a7bd746528cc3a3 SHA-256: 46661a268fa2809541d2435c72ae17e245e5ccdc0a6abb127341f9412ce140be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, with one pointing to 'https://trafficel.ru/123?utm_term=visual+motor+activities+occupational+therapy', suggesting a link farm or phishing lure. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafficel.ru/123?utm_term=visual+motor+activities+occupational+therapy
    • https://deremufirig.weebly.com/uploads/1/3/4/8/134854029/xevasafonabomoviwita.pdf
    • https://cdn.sqhk.co/fawabanof/QeYzrgg/dragon_quest_builders_2_ps4_gameplay.pdf
    • https://cdn.sqhk.co/wuvidomanale/gjghmm5/sim_sara_is_missing_walkthrough.pdf
    • https://cdn.sqhk.co/masamiwe/idSzdeX/try_not_to_laugh_challenge_markiplier_15.pdf
    • https://xekixudag.weebly.com/uploads/1/3/4/3/134336078/zutuxuvujobasop-femokovagefog-xukibaduwanug-safaxik.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c6f7e200-4b31-49ad-a9bf-1338290222ac/86914617340.pdf
    • https://uploads.strikinglycdn.com/files/6b410560-0807-44fe-9a60-fce85cb0cc71/firemaking_calculator_osrs.pdf
    • https://s3.amazonaws.com/wilugugo/red_bird_restaurant_maryland.pdf
    • https://s3.amazonaws.com/rebomedug/5475998636.pdf
    • https://uploads.strikinglycdn.com/files/2a7e09b1-cb7a-4e09-b43a-818c8f33f348/suzatezigedozogobago.pdf
    • https://uploads.strikinglycdn.com/files/8b45adca-4889-4596-99d5-65825a9509fd/pofazoxidafudagimadab.pdf
    • https://s3.amazonaws.com/rozebofukixus/useless_informally_crossword_clue.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e864.bin
9268708a5903f4bfc775cac3e98b918c1266f8fffea00b1772a33b1e691c46f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE864 5300 bytes
font_01_sfnt_off0000fa4c.bin
249ce3318b7e6bfcc979fa331cf142659e9ac1865853f110c5bf359a66edd056		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4C 11376 bytes

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